Brett and Naghmeh King are due to begin a press conference at 10am UK time this morning following their release from Spanish prison last night.
ITV News reporter Sejal Karia is in Seville:
Ashya King's parents expected to give a news conference in Seville in 30 mins after being freed frm jail last night. http://t.co/gu9ots9Dvz
Ashya King's parents told the Daily Mail they fled the UK after being told NHS treatments would leave him with life-long disabilities.
The head of the police force which applied for a European Arrest warrant against the parents of Ashya King has now urged their release.
A British mother whose son's life was saved by proton therapy has told ITV that she defied NHS doctors' advice to pursue the treatment.